add battery status pulling functions in KoboPowerD

Status files found at
http://www.mobileread.com/forums/showpost.php?p=1750642&postcount=9.

frontend/ui/device/kobopowerd.lua

@@ -5,6 +5,11 @@ local KoboPowerD = BasePowerD:new{
 	flIntensity = 20,
 	restore_settings = true,
 	fl = nil,
+	
+	batt_capacity_file = "/sys/devices/platform/pmic_battery.1/power_supply/mc13892_bat/capacity",
+	is_charging_file = "/sys/devices/platform/pmic_battery.1/power_supply/mc13892_bat/charge_now",
+	battCapacity = nil,
+	is_charging = nil,
 }
 
 function KoboPowerD:init()
@@ -23,4 +28,14 @@ function KoboPowerD:setIntensityHW()
 	end
 end
 
+function KoboPowerD:getCapacityHW()
+	self.battCapacity = self:read_int_file(self.batt_capacity_file)
+	return self.battCapacity
+end
+
+function KoboPowerD:isChargingHW()
+	self.is_charging = self:read_int_file(self.is_charging_file)
+	return self.is_charging == 1
+end
+
 return KoboPowerD